Stor-Oslo Lokaltrafikk AS or SL was the public transport administration for bus and ferry transport in Akershus, Norway from 1973 to 2007. SL was organised as a limited company owned by the Akershus county municipality, the City of Oslo, and the Norwegian Ministry of Transport and Communications, with a third each. The company planned, marketed and organised the public transport in Akershus but did not operate any buses or ferries. Instead, it issued contracts to operating companies based on public service obligations (OPS).